UFS file system, 115, 123
CD-ROM and, 108
creating, 113
Extended Fundamental Types and, 110
hard disk and, 108
large file systems and, 110
logging and, 110
maximum size of, 127
multiterabyte file systems and, 110
UFS snapshot, 290, 301
restoring, 299–301
virtual device and, 290, 291
UID, 189, 190, 193, 501
numbers and, 188
Uniplexed Information and Computing Service (UNICS), 6
universal disk format (UDF), 108
DVD and, 108, 123
UNIX, 4, 103, 182, 528
Berkeley Software Distribution (BSD), 321
characteristics of, 9
components and, 8
daemons and, 12
file organization, 16–18
files and, 91, 212
hardware architectures and, 6
history of, 7
kinds of, 6, 7, 7, 10
multiuser and multitasking system, 13
OS concepts and, 6
philosophy of, 8
platforms, distributed in tar mode, 285
source code and, 6
startup scripts, 89
structure of, 7
systems, 172
unification, POSIX standards, 10–11
UNIX commands, 13–16, 16–18, 21
structure, 14–15
argument, 14, 23
name, 14
option, 14
syntax, 23
UNIX file system (UFS), 108, 113, 123
boot block, 134
BSD fast file system and, 108
data block, 134
default for Solaris and, 108
Extended Fundamental Types and, 111
features of, 110
inode, 134
large file systems and, 111
logging and, 111
multiterabyte file systems and, 111
state flags and, 111
superblock, 134
UNIX operating system (OS), 7, 24
architecture of, 7
characteristics of, 8
command-based, 24
development of standard OS and, 10
evolution of, 6–11
history of, 6–9
kernel and, 7
multiple processes and, 8
multiple uses and, 8
network protocols and, 8
UNIX startup scripts, 352
unshielded twisted pair (UTP) cables, 351
upgrade, 36
live, 29
modifications and, 37–38
on a SPARC machine, 35–38, 36
on an x86 machine, 38–42
U.S. Department of Defense Advanced Research Projects Agency(ARPA), 313
user
adding to group, 180
administration, 165–196
anonymous, 169
groups and, 188
log in, 184
name, 167–168, 188, 192
password, 187
root, 204
subtrees, 169
switching, 204
work environment, 166
customizing, 187
user access, restricting, 207
user access to printing, controlling, 260–263
user accounts, 190
adding, 187
basics of, 166–175
components of, 167, 186, 187
creating, 180, 186, 187
with the SMC GUI tool, 182–183
deleting, 179, 187, 193
files, 171
information about, 187
managing, 175–187
with shell command line, 176–182
with the SMC GUI, 182–184
modifying, 187
structure, 167–170
user administration, security and, 187
User Datagram Protocol (UDP), 316
user designation, 217
group, 217
other, 217
user, 217
user ID (UID), 169–170, 187, 192, 235
effective, 242
integers and, 169
real, 242
user initialization files, 184–185
login shells, 184
default, 185
user logins, 167
disabling, 202
name, 187, 189
temporarily disabling, 202
work environment and, 185, 187
users
attempt to switch, 227
multiple, 187
passwords and, 223
switching on a system, 203
unauthorized, 198
without passwords, finding, 225
USF file system, 125
restoring, 293
utility, defined, 12
UTP, cables, 325
categories (cats), 326
UTP, network, 328